This is a document distributed by the automaker to its authorized dealers, informing technicians of known problems and how to fix them -- for example, if a vehicle comes into the shop making a specific noise, the TSB tells the technician what is most likely causing the problem, which saves diagnostic time. The repair may be covered under the vehicle's warranty, depending on the problem and the vehicle's warranty coverage, but a TSB is not a warranty itself. Warranty Direct provides coverage for these issues. "